Microstructure Characterization and Mechanical Properties of Al-SiC p Composites (original) (raw)
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Effect of addition of SiC particles on the Microstructure and Hardness of Al-SiC composite
Metallurgical and Materials Engineering, 2021
This work aims to investigate the effect of the addition of silicon carbide particles on the microstructure and the hardness of the Al-SiC metal matrix composites. The said composite is prepared using the stir casting technique for different weight percentages of the SiC particles. The higher composition of the reinforcement causes the clustering of the particles in the matrix. Thus, research has to be carried out on the aluminum-silicon carbide composites with the reinforcement 3wt%, 6wt%, 9wt%, and 12wt% of SiC particles to obtain the optimized composition. In order to study the microstructure and the reinforcement distribution in the matrix, a scanning electron microscope is utilized. The hardness testing has been carried out using the Vickers’ indentation technique for the as-cast and age hardening conditions. From the microstructural study, it is observed that the microstructure of the said composite exhibits the uniform distribution of the reinforcement. The EDX results show t...
Thermal, Hardness and Microstructural Characterization of Al-Si-SiC<sub>p</sub> Composites
Journal of Minerals and Materials Characterization and Engineering, 2012
This study investigated the effects of silicon and silicon carbide particles contents on the thermal, hardness and microstructural behaviour of Al-Si-SiC p composites. 16 samples of the composite produced by stir casting technique were of silicon contents of 1, 2, 3 and 4% by weigh, and silicon carbide contents of 0.5, 1, 1.5 and 2% by weight for each composition of silicon. Each of the samples were subjected to homogenizing annealing heat treatment. Differential thermal analysis (DTA), hardness test and microstructural analysis were then performed on the samples from each composition. The results obtained showed that the hardness of the composite increased gradually as the silicon and silicon carbide particles content increased. The micrographs obtained revealed the presence of silicon carbide, silicon precipitates and aluminium carbide (Al 4 C 3) within the metallic matrix. The amounts of these phases varied with the silicon and silicon carbide content. All the samples gave DTA curves with major endothermic peaks between 550-570 o C and two sets of exothermic peaks between 580-610 o C for the first set and between 565-570 o C for the second set. It was inferred from the study that although varied silicon and silicon carbide contents affected the thermal, hardness and microstructural behaviour of the Al-Si-SiC p composites, the variation of the SiC p content had a more pronounced effect on the hardness value of the Al-Si-SiC p composite.
Thermal, Hardness and Microstructural Characterization of Al-Si-SiC p Composites
Journal of Minerals & Materials Characterization & Engineering, 2012
This study investigated the effects of silicon and silicon carbide particles contents on the thermal, hardness and microstructural behaviour of Al-Si-SiC p composites. 16 samples of the composite produced by stir casting technique were of silicon contents of 1, 2, 3 and 4% by weigh, and silicon carbide contents of 0.5, 1, 1.5 and 2% by weight for each composition of silicon. Each of the samples were subjected to homogenizing annealing heat treatment. Differential thermal analysis (DTA), hardness test and microstructural analysis were then performed on the samples from each composition. The results obtained showed that the hardness of the composite increased gradually as the silicon and silicon carbide particles content increased. The micrographs obtained revealed the presence of silicon carbide, silicon precipitates and aluminium carbide (Al 4 C 3) within the metallic matrix. The amounts of these phases varied with the silicon and silicon carbide content. All the samples gave DTA curves with major endothermic peaks between 550 – 570 o C and two sets of exothermic peaks between 580 – 610 o C for the first set and between 565 – 570 o C for the second set. It was inferred from the study that although varied silicon and silicon carbide contents affected the thermal, hardness and microstructural behaviour of the Al-Si-SiC p composites, the variation of the SiC p content had a more pronounced effect on the hardness value of the Al-Si-SiC p composite.
Characterization of Mechanical Properties and Microstructure of Aluminium Alloy-SiC Composites
Materials Today: Proceedings, 2015
In the present paper, an effort has been made to study about the mechanical properties of composites prepared using Al-18wt%Si as the base metal. The base metal was reinforced with using SiC particles having an average size of 60μm. The composite was produced using a combination of bottom pouring stir cast machine and a horizontally rotating centrifugal casting machine. The prepared samples of the composite was checked for various mechanical properties like hardness, tensile strength, toughness etc and the results obtained where then compared with the mechanical properties of alloy cast under the same conditions. It was hence found that, the addition of SiC reinforcing particles have increased the mechanical properties of the alloy to a greater extent but has reduced its toughness.
Influence of Mechanical Milling on the SiC Particulate Size in an Al-SiC Composite
Journal of Materials Engineering and Performance, 2005
Particle reinforced aluminum-matrix composites are particularly attractive for the automobile and aircraft industries, due to their light weight, high strength, and good wear resistance. In the present work, silicon carbide (SiC) particulates have been incorporated into a pure Al matrix with the help of mechanical milling in a planetary ball-mill. Composite powders were prepared using both raw as well as premilled SiC powders. The effect of milling time on the SiC particulate size was investigated. Systematic analysis of x-ray diffraction data revealed a reinforcement particle size of about 30 nm in a composite containing 50 vol.% SiC. It has been observed that the size reduction occurs at a faster rate when indirect milling is used.
Metal matrix composites are the resultant of combination of two or more elements or compounds, possessing enhanced characteristics than the individual constituents present in them. This paper deals with the fabrication of Al 2014-SiC composite and investigation of its Microstructure and Mechanical properties. 2014 Aluminium alloy is characterized by good hardness. It is selected as the base metal. The Silicon Carbide is characterized by good strength and low density (3.21 g/cm3). It is chosen as the reinforcement. Silicon Carbide is coated with Nickel by electroless method to increase its wettability and binding properties. The fabrication of metal matrix composites is done by stir casting in a furnace, by introducing the required quantities of reinforcement into molten Aluminium alloy. The reinforcement and alloy is mixed by means of stirring, with the help of a stirrer. The base alloy and the composites are then tested for mechanical properties such as tensile strength, flexural strength, impact strength and hardness. The fabricated samples have higher tensile strength and impact strength than the alloy. Microstructure of the samples, are analyzed using optical microscope.
Mechanical Properties of Al-Sic Composite Material By Melting Process
To overcome the problems faced in conventional materials like high weight, corrosion, high cost etc., lots of studies are going on to replace them with alloys/composites. And also to reduce the cost of composites. Aluminium materials found to be the best alternative with its characteristics like high strength to weight ratio and low density. As development of lightweight materials has provided numerous possibilities for weight reduction. In this project we are casting aluminium based (Al 6061) composites with silicon carbide as reinforcement. Among the various methods, stir casting method is chosen as it is simple, less expensive and used for mass production. In this stir casting process, the reinforcing phases are distributed into molten aluminium by manual stirring. And then the casted samples are machined to required dimensions and different material testings had been conducted to obtain the material properties and characteristics.. In this Experiment have been conducted by varying weight fraction of SiC (5%, 10%, 15%, 20%, 25%, and 30%), while keeping all other parameters constant. The results indicated that the method used in this is successful to obtain uniform dispersion of reinforcement in the metal matrix. This composite material has improved mechanical properties like strength, stiffness, abrasion and impact resistant, and is not easily corroded. This material will have improved applications in aerospace, automotive industry etc.
IOP Conference Series: Materials Science and Engineering, 2018
Aluminum reinforced with silicon carbide composites areextensively used in automobile industries and aerospaceowing to their favourable microstructure and improved mechanical behaviour with respect to pure aluminium but at a lower cost. Aluminium is remarkable for the low density and its ability to resist corrosion. The aim of present study istoevaluate the mechanical and microstructural properties of aluminum with silicon carbide (average particle size 30-45μm) reinforced in varying weight percentages (wt %) ranging from 0-15 wt% in a step of 5% each. Ultimate tensile strength, micro hardness and density of the fabricated composites were investigated as a function of varying SiC wt%. Microstructure analysis was carried out on casted composites using optical microscopy and scanning electron microscopy. From micrographs it is clear that fair distribution of reinforcing particles in the matrix and also observed some clustering and porosity in the cast material. Results revealed that, the addition of SiC reinforcement in the aluminum matrix increases the hardness and ultimate tensile strength gradually from 23 HV to 47 HV and 84 MPa to 130 MPa respectively.
Effect of Modifier on Mechanical Properties of Aluminium Silicon Carbide (Al-SiC) Composites
Procedia Engineering, 2017
The silicon carbide particle reinforced aluminum matrix composites are expected to have many applications in aerospace, aircraft, automobile and electronic industries. Aluminium Silicon Carbide (Al-SiC) is also used for Advanced Microelectronic Packages. In this study, effect of different weight percentage of strontium on microstructure and mechanical properties of Al-SiC composite and Al-12Si (LM6) was investigated. In this research, scanning electron microscope equipped with EDS was used to define how modifier effect on microstructure. To fabricate Al-SiC composite, 10 wt% silicon carbide and different percentages (0.02, 0.5) Wt % of Al-10Sr was added to Al-11.6Si (LM6) by using vortex method for mixing the particles. The influence of adding different amount of Al-10Sr (0.01, 0.02, 0.5) Wt% on mechanical behavior of aluminum was also examined. The results found that UTS for aluminum increased by adding SiC and Sr. It was observed that the tensile for the composite did not increase dramatically. It was concluded the weak interface between particles and matrix, decreased the UTS. On the other hand strong interface between particles or fibers in the matrix showed high stiffness and strength but typically a low resistance to fracture.
2019
In this study, Medium strength AA7020 alloy was reinforced with SiC powder particles by Friction Stir Processing (FSP) technique. Samples were subjected to multiple passes with changing direction of rotation of the tool between subsequent passes. Characterization of macrostructure and microstructure was achieved by optical microscopy (OM) and scanning electron microscope (SEM) of the modified surfaces. Tensile test and Vicker's Hardness test were carried out on resulted composite for characterization of mechanical properties. As a result, it was found that SiC particles were good distributed inside the substrate with an average penetration depth of about 5mm. The AMMCs (Aluminum Metal Matrix Composites) produced in this way had excellent bonding between matrix and reinforced particles. Moreover, the grain refinement of matrix and improved distribution of particles were obtained after each FSP pass. The hardness of produced composite surfaces was improved by 1.8 times as compared to that of base alloy.